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ALEXANDER  VOK   HUMBOLBT.                  79
Ganges, surveyed the splendid remains of the old
Peruvian viaduct of Inka, which leads from Cuzco to
Assuay, and then arrived at the Amazon. Here, In
the province Jaen de Bracamoros, Humboldt corrected
and revised the chart of the Amazon made by the
French astronomer, Conclomime, by sketching a most
accurate chart of this anknown portion of the great
stream,, partly from his own observations on an excur-
sion to the cataracts of Retaina, partly from careful
inquiries; Bonpland., in the mean, time, continuing his
botanical investigations.
Grossing the high chain of the Andes for the fifth
time,   Humboldt now returned to Peru, ascertained
the position of the magnetic equator, visited the pro-
ductive highly situated silver mines of Hualguayok,
where the silver Is found 2000 feet above the level of
the sea, the hot springs of Caxamarca, and the rains
of the ancient town of Manfiche, with  its old pyra-
mids, in one of which, In the 18th century, more than
four millions French llvres of pure gold were acciden-
tally found.    Returning to Truxlllo, over the western
Cordilleras of the Andes, Humboldt, at his descent,
enjoyed the sight of the Pacific Ocean, for the first
time;  and, at the same time, looked  down into the
long  narrow valley which   Is   celebrated  because it
never rains or thunders there.    Crossing the sterile
shores of   the  Pacific  Ocean towards the  south   of
Traxillo, tlxe travellers arrived at Lima., the chief town
of Peru, where they remained for some months, and
Instituted Important climatic and astronomic Inquiries
here and In  the  neighbouring port of Oallao,   and
arrived in time to observe the last period of Mercury's
passage, before entering the sun's disk; for which pur-
pose, even heaven was propitious, as,  in Lima,   on
account of the thick fogs, the sun Is often not seen
for three weeks.    We must especially mention Hum-
"boldt's investigation of the remarkably cold Peruvian,
coast current, for, subsequently, science has given to
it the name of Humboldt current, in appreciation of
the merits of the great natural philosojjBbr